One of the things I remember the most about the Falcon 20 with the CF700's is, flying in Ice.
The tail section is not anti-iced (even though it looks like it). I've seen a ton of ice up there, but you'd never known it by the way the plane flew. It was great.
Also, an arrival that I used to have to fly into my airport (PWK) often had us a 3,000' for the last 80 miles of the flight. If you were in ice, you had to keep the power close to 90% in order to produce enough heat to keep the wings warm. That required speedbrakes to keep you below 250 knots. If you were lucky and in the F model (9100# fuel capacity) and you needed every drop because, at 3,000' and 90% power you are burning around 6,000# per hour! Cuts your range significantly!!!
And, as Falcon Capt said, don't plan on climbing with the anti-ice on!
Just like any airplane, they have their good points and bad points. Pilots often complain about an airplane when you try to do things the plane just isn't capable of doing, ie short runways, long legs, hot/high operations, etc. Unfortunately, owners often buy an airplane that is not capable of doing what they want to do, mostly due to bad advice from brokers.
Even a C model with CF700's is a good airplane if you are using a 6,500' runway (S.L.), and going distances around 800 miles or less. If that is your mission, it is a lot of airplane for around $2 Million.
Enjoy,
JetPilot500